[Offline Pages] Converts MarkAttemptCompleted to use TaskQueue

components/offline_pages/background/request_queue.h

Index: components/offline_pages/background/request_queue.h
diff --git a/components/offline_pages/background/request_queue.h b/components/offline_pages/background/request_queue.h
index 7ad0e49da4618ec9f5e853eab1bb36834c3e344b..66db71b8b5437b39d596a1e6395b90d925d4ff9c 100644
--- a/components/offline_pages/background/request_queue.h
+++ b/components/offline_pages/background/request_queue.h
@@ -103,6 +103,11 @@ class RequestQueue {
   // |callback|.
   void MarkAttemptAborted(int64_t request_id, const UpdateCallback& callback);
 
+  // Marks attempt with |request_id| as completed. The attempt may have
+  // completed with either success or failure (not denoted here). Results
+  // are returned through |callback|.
+  void MarkAttemptCompleted(int64_t request_id, const UpdateCallback& callback);
+
   void GetForUpdateDone(
       const RequestQueue::UpdateRequestCallback& update_callback,
       const SavePageRequest& update_request,